构建 Docker 镜像时如何修复“ModuleNotFoundError”

# Introduction

When building Docker images for Python applications, developers often encounter the 'ModuleNotFoundError' message. This error occurs when Python cannot locate a module or package that your application requires. For Docker beginners, this can be particularly challenging to troubleshoot.

In this hands-on lab, you will create a simple Python application, containerize it with Docker, encounter the ModuleNotFoundError, and learn practical ways to resolve it. By the end, you will understand how to properly manage Python dependencies in Docker images and avoid this common issue in your projects.